mybatis主要配置文件及项目目录总结

配置总结

1、父工程pom依赖

<!--    导入依赖-->
    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!-- mybatis驱动 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <!-- junit测试包 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!-- log4j日志 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!-- lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
        </dependency>
    </dependencies>
    <!--在build中配置resources，来防止我们资源导出失败的问题-->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>16</source>
                    <target>16</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

2、mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<!--configuration 核心配置文件-->
<configuration>
<!--    引入外部配置文件-->
    <properties resource="db.properties"/>
<!--    日志设置-->
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
<!--    别名优化-->
    <typeAliases>
        <package name="com.luo.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
<!--    每一个mapper.xml都需要在这个mybatis核心文件中注册-->
    <mappers>
    </mappers>
</configuration>

3、db.properties

driver = com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
username=root
password=123456

4、log4j.properties

#????DEBUG????????console?file???????console?file?????????
log4j.rootLogger=DEBUG,console,file

#??????????
log4j.appender.console = org.apache.log4j.ConsoleAppender
log4j.appender.console.Target = System.out
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.layout = org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n

#?????????
log4j.appender.file = org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./log/luo.log
log4j.appender.file.MaxFileSize=10mb
log4j.appender.file.Threshold=DEBUG
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%p][%d{yy-MM-dd}][%c]%m%n

#??????
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

5、MybatisUtils

//sqlsessionFactory构建sqlsession
public class MyBatisUtils {
    private static SqlSessionFactory factory=null;
    static {
        try {
            String resource = "mybatis-config.xml";
            InputStream in= Resources.getResourceAsStream(resource);
            //创建SqlSessionFactory对象
            factory=new SqlSessionFactoryBuilder().build(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    //获取SqlSession的方法
    public static SqlSession getSqlSession() {
        SqlSession sqlSession=null;
        if(factory!=null) {
            //如果不设置参数或者参数为false就是手动提交事务，参数设置为true就是自动提交事务
            sqlSession=factory.openSession(true);
        }
        return sqlSession;
    }
}

6、IDutils

//生成随机id的工具类
public class IDutils {
    public static String getId(){
        return UUID.randomUUID().toString().replaceAll("-","");
    }

    @Test
    public void test(){
        System.out.println(IDutils.getId());
    }
}

7、mappper.xml文件开头

<?xml version="1.0" encoding="UTF8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="">

8、测试文件

public class myTest {
    @Test
    public void test(){
        SqlSession sqlSession = MyBatisUtils.getSqlSession();
        BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);
        ////////
        sqlSession.close();
    }
}

9、工程结构

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